I've had Norman for about 4 years, and I've never heard him whinny. Not even nicker. The only sound he ever makes is a snort. Even when he's out in the pasture alone and he's looking for his buddies. It's weird.
I'm curious to know what his voice sounds like. He's very quiet.
Victor, on the other hand, is rather vocal. Have you ever had a horse whinny while you're on them bareback? Weirdest feeling ever. lol